Re: RE:
Perhaps it's a Clone Tank! Or a hologram projector! Or a meditation chamber! Or some sort of transport tube! Or an execution cubicle! Or a VR simulator! Or a time machine! Or a teleporter! Or a phonebox! Or a health-regaining machine! Or a trampoline! Or a cage/enclosure! Or the (odd) cockpit of a vehicle! Or a karaoke machine!
Ya know it could be any of those!